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rasterVis

The raster package defines classes and methods for spatial raster data access and manipulation. The new rasterVis package complements raster providing a set of methods for enhanced visualization and interaction. It is now at CRAN.

I finally understood what you were talking about. There is an easy solution with the panel.2dsmoother function of the latticeExtra package. Using the SISmm data of the example from the hovmoller help page:

I have a question about levelplot. I use levelplot in the same fashion of your example : levelplot(SISmm) (12 panels for 12 months). Nevertheless when I use postscript () or png() font size is too small for me.
I succeed to increase font size for axis labels but I really don’t know how to increase font for panel names. Do you have an idea ?